Weird AK preflop spot with tons o action to us

[TheGreenMile]

i dont know about these spots.. utg raiser is a guy i had like 20 hands on so far, seemed solid thus far, but was at 20 pfr percentage. button/reraiser is yanjiegou2007 who i have at 23/12 over a pretty fair sample but who i have seen do some pretty spewy stuff. sb is like 45/11 or so and seems fishy.. so what now?

Full Tilt Poker, $1/$2 NL Hold'em Cash Game, 6 Players
LeggoPoker Hand History Converter

UTG: $274.85
MP: $275.50
CO: $202.30
BTN: $195
SB: $140.65
Hero (BB): $285.90

Pre-Flop: A[img]/images/graemlins/spade.gif[/img] K[img]/images/graemlins/heart.gif[/img] dealt to Hero (BB)
<font color="red">UTG raises to $6</font>, MP folds, CO calls $6, <font color="red">BTN raises to $27</font>, SB calls $26, Hero says WTF???